In order for the experimenter to be able to conclude that changes ...

[cnetterville]

In order for the experimenter to be able to conclude that changes in one variable are causing the other variable to change, what must be true?
 
  a. There should be a confounding of other variables in the situation.
  b. The statistical analysis must show that the results had a high probability of occurring by chance alone.
  c. Nothing else must change besides the manipulated variable and the measured variable.
  d. All of these must be true.

Question 2

When the experimenter manipulates the independent variable, there should be a corresponding change in the _____ variable if there is a cause-effect relationship between them.
 
  a. independent c. inductive
  b. dependent d. deductive

[maya.nigrin17@yahoo.com]

Answer to Question 1

C
In order to test the cause-effect relationship between the independent and dependent variables, there must be NO other changes occurring.

Answer to Question 2

B
The experimenter manipulates the independent variable and measures the dependent variable to see if it changed with the manipulation of the independent variable.

[cnetterville]

TYSM

[samiel-sayed]

Great answer, keep it coming